Petrified wood is a beautiful material that forms over thousands of years. It occurs when forests get covered in rock and sediment. Which statement is true? 1. It is a mineral now that the Earth has changed it

2. It is not a mineral because the material was organic

3. It is a mineral as long as it displays the crystal structure

4. It is not a mineral because it has a definite composition

Actual age your first developed of age well comparison age refers to absolute age true or false

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.

True or false multiple lane changes must be done individually going through the same procedures for each lane change